<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <style>
    .box {
      width: 800px;
      height: 700px;
      border: 1px solid green;
      display: flex;
      justify-content: center;
    }
    .box1 {
      display: flex;
      justify-content: space-between;
      width: 400px;
      height: 250px;
      align-items: flex-end;
    }
    .box2 {
      width: 100px;
      height: 100px;
      border: 1px solid rgb(6, 6, 6);
    }
  </style>
  <body>
    <div class="box">
      <div class="box1">
        <div class="box2"></div>
        <div class="box2"></div>
        <div class="box2"></div>
      </div>
    </div>
  </body>
</html>
